<?php


    //echo phpinfo();
    $max_w= isset($_GET['w'])?$_GET['w']:300;
    $im = thumbnail($_GET['url'], $max_w);

    imageToFile($im);
    
    

    /**
     * Create a thumbnail image from $inputFileName no taller or wider than 
     * $maxSize. Returns the new image resource or false on error.
     * Author: mthorn.net
     */
    function thumbnail($inputFileName, $maxSize = 200)
    {
        $info = getimagesize($inputFileName);

        $type = isset($info['type']) ? $info['type'] : $info[2];

        // Check support of file type
        if ( !(imagetypes() & $type) )
        {
            // Server does not support file type
            $sourceImage = imagecreatefromstring(file_get_contents('http://img.ivsky.com/img/tupian/pre/201108/17/haiyang_qianshui_yulei-006.jpg'));
            return $sourceImage;
        }

        $width  = isset($info['width'])  ? $info['width']  : $info[0];
        $height = isset($info['height']) ? $info['height'] : $info[1];

        // Calculate aspect ratio
        $wRatio = $maxSize / $width;
        $hRatio = $maxSize / $height;

        // Using imagecreatefromstring will automatically detect the file type
        $sourceImage = imagecreatefromstring(file_get_contents($inputFileName));

        // Calculate a proportional width and height no larger than the max size.
        if ( ($width <= $maxSize) && ($height <= $maxSize) )
        {
            // Input is smaller than thumbnail, do nothing
            return $sourceImage;
        }
        //elseif ( ($wRatio * $height) < $maxSize )
        //{
            // Image is horizontal
            $tHeight = ceil($wRatio * $height);
            $tWidth  = $maxSize;
        //}
        //else
        //{
            // Image is vertical
            //$tWidth  = ceil($hRatio * $width);
            //$tHeight = $maxSize;
        //}

        $thumb = imagecreatetruecolor($tWidth, $tHeight);

        if ( $sourceImage === false )
        {
            // Could not load image
            $sourceImage = imagecreatefromstring(file_get_contents('http://img.ivsky.com/img/tupian/pre/201108/17/haiyang_qianshui_yulei-006.jpg'));
            return $sourceImage;            
            //return false;
        }

        // Copy resampled makes a smooth thumbnail
        imagecopyresampled($thumb, $sourceImage, 0, 0, 0, 0, $tWidth, $tHeight, $width, $height);
        imagedestroy($sourceImage);

        return $thumb;
    }

    /**
     * Save the image to a file. Type is determined from the extension.
     * $quality is only used for jpegs.
     * Author: mthorn.net
     */
    function imageToFile($im, $fileName, $quality = 90)
    {
        if ( !$im || file_exists($fileName) )
        {
            $sourceImage = imagecreatefromstring(file_get_contents('http://img.ivsky.com/img/tupian/pre/201108/17/haiyang_qianshui_yulei-006.jpg'));
            return $sourceImage;            
           //return false;
        }

        $ext = strtolower(substr($fileName, strrpos($fileName, '.')));
        $ext = '.jpg';

        switch ( $ext )
        {
            case '.gif':
                imagegif($im, $fileName);
                break;
            case '.jpg':
            case '.jpeg':
                header('Content-Type: image/jpeg');
                imagejpeg($im, $fileName, $quality);
                break;
            case '.png':
                imagepng($im, $fileName);
                break;
            case '.bmp':
                imagewbmp($im, $fileName);
                break;
            default:
                $sourceImage = imagecreatefromstring(file_get_contents('http://img.ivsky.com/img/tupian/pre/201108/17/haiyang_qianshui_yulei-006.jpg'));
                return $sourceImage;                
                //return false;
        }

        return true;
    }    
?>